Controlling-switch.



G, H. HILL.

CONTROLLING SWITCH.

APPLIOATION FILED 00111, 1906.

Patented Feb. 9, 1909.

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- UNITED emcee Peres? comes;

GEORGE H. HILL, 0F SGHENE'CTADY, NEW YGRK, ASSIGNUR TO GENERAL ELECTQZG OOMEPANY, A 'GORPOBATION OF NEW YORK.

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Specification of Letters Patent.

Application filed Gctcbcr 11, 19%. Serial No. 338,889.

Patented Feb. 9, ieoot and is particularly applicable to controllingswitches for electric motors, elthough not limited to switchesemgfloyed for this poi:-

One well kiiown method of control tor e Flurality of electric motors is the series-persicl control, in which the motors ere first connected in series with each other with s reeistaaice circuit, then the resistance is gradually out out, then the motors are connected in perellel with the resistance again in circuit and then the resistance is again out out; it is usually desirable to perform these several operations by moons of e single switch, but when the number of resistance steps is large, the number 0t switch contacts required is greet, since the process of cuttiiig out the resistance is performed twice in the movement of the switch. The object of my invention is to reduce the number of contacts required, and consequently the sim of the switoli, and consists providing two switch members, one of which may melee the series-parallel or other commotions, end the other of which may be erranged to very the resistance in circuit, sod employing connections between the two switch members such that when the first switch member is moved over each set of contacts, the other member is moved over its range end is eelessed upon transition of the first switch member from one set of contacts to soother. Thus b row/id the second 7 y P mg marches with moons for retiirmleg it ectomoticoll to stsstieg goosition when released,

it may co ce'csed to move over its sci-ego o number oi? times dorm e Slfifll) movement ot the other Witch mom 1'. in this Wey toe some set of cootscts is util sed for cutting the resistsece out of circuit in each case, so that the number of contacts requiredeod the size of the switch is zreduced.

My mveetsoai will best be ndcrstood by reference to the accompanying 'drevrng,

)which shows 'somewloot diegmremeticolly tote controlling switch arranged in accordance with my invention.

In the drawing, A IQT6S8$S e switch one provided with any suitebie form of henctle indicated by the dotted circle a. This one carries two contests s end (2 which move over stationery ccstscts I) to b (3 represents s second one which is normolly held in oil-position sgsinst o sto c by the spring c. This arm C is ectueted y the movement of arm A three is connections comprising e mutilsted gear 5031 the A and e inion d on the one C. This iziicii is gorovidgd with 'ose toot-3c d} orresge so as to resist pressure in one direction, but to yield to pressure in the opposite direction, for reasons that will hereafter epgoesr. The arm C moves over as long contact E end at plurality of contact studs c connected to points 02 the resistance R Y i l have shown two motors G end G as the devices controlled by the switch, but it will be understood that the switch construction shown is applicable to the control of other cote? leading to e contacts b of end 57 seed motor G to The motors are thus connected in seyies with all the resistances in. circuit. As the emo A is moved toward the sight, the sezies cosmostion of the mot/05s is maintained, but one C is moved totvesd the left, so so to cut-zr-es -st once F gradually out of circuit. The spring octueted tooth d of the pinion resists the pressus'e upon it during movement oi the terms is this direction, acts as though it were rigid. When the arm reaches the right-hand end cootscts c and Z) hes reechedits, extreme left-bend end ell of resistance cut out o v Now, if the movement of some A to the 1/ continued, so as to bieeli the mote; leeving the contests b and tithe teeth on mutilsted eel D et the some time the pinion so that the C returned to stertiog position by the spring. c t Conseqcently, when orm A brought iota resistance F is again in circuit. As the move- W resistance in the field circuit, and to other ment of arm A is continued toward the right, arm (3 is agam moved toward the lert, cutting out the resistance.

The purpose of the spring-actuated tooth d will be seen by considering the return movement of the arm. Suppose arm A has been moved toits extreme r1ght-hand position, thereby carrying arm U to its extreme left-hand position so as to connect the motors in parallel, with all the resistance cut out of circuit: now, if arm A is moved toward the left, arm (3 will be returned toward the right, and will reach the stop 0 when arm A leaves contacts 6 to t t hat is, arm 0 and pinion d would be in the position shown in the drawing, while arm A. would be in a vertical position. U on attempting to move arm A further to t e left and it this tooth were rigid the return to offositionof arm A. would be prevented, but

y mounting -the tooth as shown, it yields to the pressure, allowing arm A to be returned to its ori pcsition as shown.

Although I have illustrated and described my invention as applied to the control of series motors with the resistance in the armature circuit, myinvention is equally applicable to the control of shunt motors with the devices than motors: Further, ldo not desire to limit myself to the particular construction and arrangement of parts here shown, but aim in the appended claims to cover all modifications which are within the scope of my invention.

tending over a portion of the range of movement of said member, a second pivoted memher, a set of contacts arranged to be engaged thereby, and operative connections between said members whereby the second member is moved over its range durin the movement of the first member ever see set of contacts and is moved in the o posite'direction to starting position upon t e transition of "the first memberirom one set of contacts to another. T a

2. in a controlling-switch, a switch member, a pluralit of sets of contacts arranged. to be engage thereby, each set extending over'a port on of the range of movement of said member, a second member, a set of'con-, vtacts arranged to be engaged thereby, 0 erative connections" between said mem are adapted to engage and move the second member upon the movement of the first member over each set of contacts and to rethe teeth on the gear D will M press noon the left-hand face of the tooth d What I claim as new and desire to secure cranes lease the second member upon the transition of the first member from one set of contacts to another, and means for automatically returning the second member to starting position when released.

3. In a controlling-switch, two switch members, a mutilated gear on one member, a pinion on the second member adapted to be engaged by said gear, and means for automatically returning the second member to starting position when released.

4. In a controllingswitch, two switch members, a mutilated gear on one member, a pinion on the second member adapted to be engaged by said gear, means for automatically returning the second member to starting position when released, and means for ermitting the return movement of the st member without moving the second member when thesecond'member is in starting position.

5. 111 combination with an electric circuit and a plurality of devices therein, a controlling-switch for said devices comprising a switch member arranged to vary the relative connections of said devices to each other, a second switch member arranged to vary the amount of resistance in said circuit, a mutilated gear on the first member, a pinion on the second member adapted to be enga ed by said gear, and means for automaticaly returning the second member to off-position when released.

6. In combination with an electric circuit and a plurality of devices therein, a control ling-switch for said devices comprising a switch member arranged to vary the relative connections of said devices to each other, second switch member arranged to vary the "amount oi resistance in said circuit, a mutilated gear on the first member, a pinion on the second member adapted to be engaged by'said gear, means for automatically returning the second member to ofi-position when released, and means for permitting the return movement of the first member withoutmoving the second member when the second member is in ofi-position.

7. In combination with an electric circuit and a plurality of devices therein, a controlling-switch for said devices comprising a switch memberand a plurality of sets of contacts cooperating therewith to connect said devices in different relations to each other,

each set of contacts extending over a portion of the range of movement of said member, a second switch member and contacts cooperating' therewith to vary the amount of resistance in said circuit, operative connections between said members adapted to engage and move the second member upon the movement of the first member over each set I of contacts andto release the second member upon the transitiori of the-first member from; one set or contacts to another, and meansfor automatically returning the second member onegdirection and tolresist; pressure in the '10 to starting position when released. op osite direction.

8. In a controlling switch, two switch fn witness whereof, I have hereunto set my members, a mutilated gear on one member, a hand this 9th day of October, 1906. 5 pinion on the second member adapted to be engaged by said gear, and means for auto- GEORGE HILL matically returning1 the second member to Witnesses: starting position w en released, said pinion BENJAMIN B. HULL,

having a tooth adapted to yield to pressure in 4 HELEN ORFORD. 

